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I agree about the two systems. Perhaps it uses acoustic to get a rough location, and laser to pinpoint the sniper's scope.

But I don't see how it can tell one curved lens from another: scope or eyeglass.

From Reply 34: The technology enables the building of databases of specific optical device signatures to better assess threat levels.

This is the laser based system if I am not mistaken. In other words, it sounds like they can characterize the signatures of different types of returns and put those in a database.

A specific return signal would be matched against the database to try to determine the source. If that particular signature was flagged for an alarm, the user would be notified. That means it would be able to eliminate things like window glass.

If the engineers decide what to flag for alarms and what not to, it will be a relatively simple system to operate, but not as robust. If the user does the flagging, the system would be much more useful, but harder to set up and maintain.

Although the two systems could possibly be used in conjunction as you suggest, it sounds like they are just two competing technologies for the same type of job from the descriptions.

Ruck